#define _CRT_SECURE_NO_WARNINGS 1
#pragma once
#include<iostream>
#include<assert.h>
using namespace std;
namespace jyz
{
	class string
	{
	public:
//		string();
		string(const char* str = "");
		~string();

		const char* c_str() const;

		size_t size() const;

		char& operator[](size_t pos);
		const char& operator[](size_t pos) const;

		typedef char* iterator;
		typedef const char* const_iterator;

		iterator begin();
		iterator end();
		const_iterator begin() const;
		const_iterator end() const;

		void reserve(size_t n);
		void push_back(char ch);
		void append(const char* str);

		string& operator+=(char ch);
		string& operator+=(const char* str);

		void insert(size_t pos, char ch);
		void insert(size_t pos,const char* str);
		void erase(size_t pos, size_t len=npos);

		size_t find(char ch, size_t pos);
		size_t find(char* sub, size_t pos);

		string(const string& s);

		string& operator=(const string& s);

		void swap(string& s);

		string substr(size_t pos=0, size_t len=npos);

		bool operator<(const string& s)const;
		bool operator==(const string& s)const;
		bool operator<=(const string& s)const;
		bool operator>=(const string& s)const;
		bool operator!=(const string& s)const;
		bool operator>(const string& s)const;

		void clear();
	private:
		char* _str;
		size_t _size;
		size_t _capacity;

		const static size_t npos;
	};
	istream& operator>>(istream& is, string& str);
	ostream& operator<<(ostream& is, string& str);
}